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A universal preamplifier#

A universal preamplifier (preamp) which is really useful for many applications.

Amplification adjustable from 0...80dB, for almost any sources, ranging from capacitive pickups of vintage record players to dynamic microphones. Very low noise.

Modified: added a pseudo log pot. However, this circuit still needs some work. The bode plot shows it amplifying up to RF.

This is not a good idea for a high gain preamplifier, as it could suffer from horrible parasitic RF oscillations and other undesirable nasty effects.

Note

To see a large version of this diagram, right click the diagram and select 'open in new tab'

M0OOZ - YooFab / CC BY NC ND

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